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diff --git a/org.argeo.slc.repo/src/org/argeo/slc/repo/osgi/SubArtifact.java b/org.argeo.slc.repo/src/org/argeo/slc/repo/osgi/SubArtifact.java
new file mode 100644
index 000000000..9ce84555d
--- /dev/null
+++ b/org.argeo.slc.repo/src/org/argeo/slc/repo/osgi/SubArtifact.java
@@ -0,0 +1,214 @@
+package org.argeo.slc.repo.osgi;
+
+import java.io.File;
+import java.util.Map;
+
+import org.eclipse.aether.artifact.AbstractArtifact;
+import org.eclipse.aether.artifact.Artifact;
+
+/**
+ * An artifact whose identity is derived from another artifact. <em>Note:</em> Instances of this class are immutable and
+ * the exposed mutators return new objects rather than changing the current instance.
+ */
+final class SubArtifact
+    extends AbstractArtifact
+{
+
+    private final Artifact mainArtifact;
+
+    private final String classifier;
+
+    private final String extension;
+
+    private final File file;
+
+    private final Map<String, String> properties;
+
+    /**
+     * Creates a new sub artifact. The classifier and extension specified for this artifact may use the asterisk
+     * character "*" to refer to the corresponding property of the main artifact. For instance, the classifier
+     * "*-sources" can be used to refer to the source attachment of an artifact. Likewise, the extension "*.asc" can be
+     * used to refer to the GPG signature of an artifact.
+     * 
+     * @param mainArtifact The artifact from which to derive the identity, must not be {@code null}.
+     * @param classifier The classifier for this artifact, may be {@code null} if none.
+     * @param extension The extension for this artifact, may be {@code null} if none.
+     */
+    public SubArtifact( Artifact mainArtifact, String classifier, String extension )
+    {
+        this( mainArtifact, classifier, extension, (File) null );
+    }
+
+    /**
+     * Creates a new sub artifact. The classifier and extension specified for this artifact may use the asterisk
+     * character "*" to refer to the corresponding property of the main artifact. For instance, the classifier
+     * "*-sources" can be used to refer to the source attachment of an artifact. Likewise, the extension "*.asc" can be
+     * used to refer to the GPG signature of an artifact.
+     * 
+     * @param mainArtifact The artifact from which to derive the identity, must not be {@code null}.
+     * @param classifier The classifier for this artifact, may be {@code null} if none.
+     * @param extension The extension for this artifact, may be {@code null} if none.
+     * @param file The file for this artifact, may be {@code null} if unresolved.
+     */
+    public SubArtifact( Artifact mainArtifact, String classifier, String extension, File file )
+    {
+        this( mainArtifact, classifier, extension, null, file );
+    }
+
+    /**
+     * Creates a new sub artifact. The classifier and extension specified for this artifact may use the asterisk
+     * character "*" to refer to the corresponding property of the main artifact. For instance, the classifier
+     * "*-sources" can be used to refer to the source attachment of an artifact. Likewise, the extension "*.asc" can be
+     * used to refer to the GPG signature of an artifact.
+     * 
+     * @param mainArtifact The artifact from which to derive the identity, must not be {@code null}.
+     * @param classifier The classifier for this artifact, may be {@code null} if none.
+     * @param extension The extension for this artifact, may be {@code null} if none.
+     * @param properties The properties of the artifact, may be {@code null}.
+     */
+    public SubArtifact( Artifact mainArtifact, String classifier, String extension, Map<String, String> properties )
+    {
+        this( mainArtifact, classifier, extension, properties, null );
+    }
+
+    /**
+     * Creates a new sub artifact. The classifier and extension specified for this artifact may use the asterisk
+     * character "*" to refer to the corresponding property of the main artifact. For instance, the classifier
+     * "*-sources" can be used to refer to the source attachment of an artifact. Likewise, the extension "*.asc" can be
+     * used to refer to the GPG signature of an artifact.
+     * 
+     * @param mainArtifact The artifact from which to derive the identity, must not be {@code null}.
+     * @param classifier The classifier for this artifact, may be {@code null} if none.
+     * @param extension The extension for this artifact, may be {@code null} if none.
+     * @param properties The properties of the artifact, may be {@code null}.
+     * @param file The file for this artifact, may be {@code null} if unresolved.
+     */
+    public SubArtifact( Artifact mainArtifact, String classifier, String extension, Map<String, String> properties,
+                        File file )
+    {
+        if ( mainArtifact == null )
+        {
+            throw new IllegalArgumentException( "no artifact specified" );
+        }
+        this.mainArtifact = mainArtifact;
+        this.classifier = classifier;
+        this.extension = extension;
+        this.file = file;
+        this.properties = copyProperties( properties );
+    }
+
+    private SubArtifact( Artifact mainArtifact, String classifier, String extension, File file,
+                         Map<String, String> properties )
+    {
+        // NOTE: This constructor assumes immutability of the provided properties, for internal use only
+        this.mainArtifact = mainArtifact;
+        this.classifier = classifier;
+        this.extension = extension;
+        this.file = file;
+        this.properties = properties;
+    }
+
+    public String getGroupId()
+    {
+        return mainArtifact.getGroupId();
+    }
+
+    public String getArtifactId()
+    {
+        return mainArtifact.getArtifactId();
+    }
+
+    public String getVersion()
+    {
+        return mainArtifact.getVersion();
+    }
+
+    public String getBaseVersion()
+    {
+        return mainArtifact.getBaseVersion();
+    }
+
+    public boolean isSnapshot()
+    {
+        return mainArtifact.isSnapshot();
+    }
+
+    public String getClassifier()
+    {
+        return expand( classifier, mainArtifact.getClassifier() );
+    }
+
+    public String getExtension()
+    {
+        return expand( extension, mainArtifact.getExtension() );
+    }
+
+    public File getFile()
+    {
+        return file;
+    }
+
+    public Artifact setFile( File file )
+    {
+        if ( ( this.file == null ) ? file == null : this.file.equals( file ) )
+        {
+            return this;
+        }
+        return new SubArtifact( mainArtifact, classifier, extension, file, properties );
+    }
+
+    public Map<String, String> getProperties()
+    {
+        return properties;
+    }
+
+    public Artifact setProperties( Map<String, String> properties )
+    {
+        if ( this.properties.equals( properties ) || ( properties == null && this.properties.isEmpty() ) )
+        {
+            return this;
+        }
+        return new SubArtifact( mainArtifact, classifier, extension, properties, file );
+    }
+
+    private static String expand( String pattern, String replacement )
+    {
+        String result = "";
+        if ( pattern != null )
+        {
+            result = pattern.replace( "*", replacement );
+
+            if ( replacement.length() <= 0 )
+            {
+                if ( pattern.startsWith( "*" ) )
+                {
+                    int i = 0;
+                    for ( ; i < result.length(); i++ )
+                    {
+                        char c = result.charAt( i );
+                        if ( c != '-' && c != '.' )
+                        {
+                            break;
+                        }
+                    }
+                    result = result.substring( i );
+                }
+                if ( pattern.endsWith( "*" ) )
+                {
+                    int i = result.length() - 1;
+                    for ( ; i >= 0; i-- )
+                    {
+                        char c = result.charAt( i );
+                        if ( c != '-' && c != '.' )
+                        {
+                            break;
+                        }
+                    }
+                    result = result.substring( 0, i + 1 );
+                }
+            }
+        }
+        return result;
+    }
+
+}
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